fix: black circle in PasswordEdit

set the size of black circle to 6 pixel by changing the font,
set the letter spacing to 200 under PercentageSpacing type.

Issue: linuxdeepin/developer-center#7335

src/widgets/dlineedit.cpp

@@ -667,6 +667,9 @@ bool DLineEdit::eventFilter(QObject *watched, QEvent *event)
         event->accept();
         pLineEdit->setFocus();
         return true;
+    } else if (event->type() == QEvent::Paint) {
+        d->lineEdit->echoMode() == QLineEdit::Password ?
+            d->lineEdit->setFont(d->passwordFont) : d->lineEdit->setFont(font());
     }
 
 //    if (d->frame)
@@ -714,6 +717,10 @@ void DLineEditPrivate::init()
     q->setFocusProxy(lineEdit); // fix DlineEdit setFocut but lineEdit can not edit(without focus rect)
     q->setFocusPolicy(lineEdit->focusPolicy());
 
+    passwordFont = lineEdit->font();
+    passwordFont.setPixelSize(6);
+    passwordFont.setLetterSpacing(passwordFont.letterSpacingType(), 200);
+
     control = new DAlertControl(lineEdit, q);
     q->connect(control, &DAlertControl::alertChanged, q, &DLineEdit::alertChanged);
 

src/widgets/private/dlineedit_p.h

@@ -48,6 +48,7 @@ class DLineEditPrivate : public DTK_CORE_NAMESPACE::DObjectPrivate
     bool bSpeechToText = true;
     bool bTextToSpeech = true;
     bool bTextToTranslate = true;
+    QFont passwordFont;
 };
 
 DWIDGET_END_NAMESPACE